/// <summary>
/// Determines the optimal page on which <paramref name="dataSource"/> should be run, by interrogating the
/// <see cref="F:ResponseFieldMap"/> to find the earliest page which contains a mapped control,
/// and returns the id of the optimal page.
/// </summary>
/// <param name="dataSource">The data source to interrogate.</param>
/// <param name="pageList">The page list containing the full control definitions.</param>
/// <returns>The id of the optimal page on which <paramref name="dataSource"/> should be run.</returns>
private int DetermineOptimalPageId(ProductDataSource dataSource, PageList pageList)
{
const int defaultVal = int.MaxValue;
Dictionary<string, int> controlPageIndexes = pageList.AccumulateControlPageIndexes();
List<string> targetFields = dataSource.ResponseFieldMap.Select(map => map.Target).ToList();
int min = defaultVal;
foreach (string target in targetFields)
{
if (controlPageIndexes.Keys.Contains(target))
{
min = Math.Min(controlPageIndexes[target], min);
}
}
return min == defaultVal ? -1 : pageList[min].PageId;
}
